To calculate a relative date 120 days in the future from 22-September, we need to add 120 days to the given date. Start by recognizing that September has 30 days. Subtract 30 from 120, leaving 90. As October has 31 days, subtract 31 from 90, leaving 59 to account for November. Lastly, deduct 30 from 59, indicating that the target date falls on 19-January.